CN1252705C - Writing-in power control method for angular speed fixed optical disk drive - Google Patents

Abstract

The present invention provides a writing-in power control method for an optical disk recorder (a CD-R, a CD-RW drive, etc.), which is used for controlling the writing-in power of a laser reading head. The method is mainly used for an optical disk drive in the operating schema of a constant angular velocity (CAV). Firstly, the optimum power control (OPC) obtains two types of reference writing-in power before carrying out the method; the two types of the reference writing-in power are respectively corresponding to two reference tangential velocities of the inner ring and the outer ring of the optical disk; then a control parameter table is established according to the two types of the reference writing-in power and the two reference tangential velocities; a memory of the present invention has a plurality of reference tangential velocities which divide the optical disk into a plurality of sections; each reference tangential velocity has corresponding reference writing-in power and reference reflected pulse level which are stored in the control parameter table; finally, the writing-in power and the target reflected pulse level of writing-in data are found out by using the control parameter table; the target reflected level is used for carrying out the running optimum power control (ROPC) to write the data into the optical disk.

Description

The Writing power control method of fixed angles speed CD player

Technical field

The invention provides a kind of Writing power manufacture method, particularly a kind of Writing power control method that is applied to fixed angles speed CD writer.

Background technology

For company or individual, the management of file or storage often are an important job.In the past, because most files all print or write on paper products, so when quantity of documents is huge,, all cause user's inconvenience easily no matter aspect volume or weight.Now along with the computer technology development, digital material extensively is used and is stored in media stored in computer, in order to allow user's store digital data more easily, various data storage devices also one after the other occur, and CD writer (compactdisk recorder) is an example.CD writer has made full use of that the discs cost is low, volume is little and characteristic capacious, on discs, allows the user can preserve data more easily data logging.

CD writer comprises a laser and/write head, and its exportable laser is with the recording layer of the sheet of imprinting CDs, and the part of imprinting (pit) represents 0, and the part of imprinting (land) does not represent 1, so promptly can digital mode store data.Right for different etch-recordable optical disk sheets, the character of its recording layer may be different, and laser is also had different energy absorption characteristics.Therefore beat on different discs when the laser of same power, may produce the imprinting result of degree varies.In view of this, each tame manufacturer can write down the required Writing power of this discs, usually for writing fashionable reference in the Lead-In Area (lead-in area) of discs when the production discs.And the CD writer that each tame manufacturer produced also can be used best power control (optimum power control usually; OPC) and instant best power control (RunningOptimum Power Control; ROPC), guarantee imprinting result's correctness.Embodiment about best power control (OPC) and instant best power control (ROPC) has detailed record in the Orange Book, existing summary description is as follows.

According to Orange Book, best power control (OPC) and instant best power control (ROPC) can be applicable to static line speed (Constant Linear Velocity; CLV) the Writing power control method of CD writer.The static line velocity mode is CD writer one of pattern that writes of adopting now.Under this pattern, Spindle Motor can be controlled the discs rotating speed, makes diverse location on the discs all be maintained at a fixing tangential velocity, to carry out the action that data writes.

Best power control (OPC) is before formally writing data, and elder generation is with a capability correction district (the power calibration area of discs; PCA) go to aforesaid fixedly tangential velocity, write test with different Writing power (normally 15) in this capability correction district again, and the result read back, with among this difference Writing power, determine the most suitable this fixing Writing power of tangential velocity.

Again generally speaking, because the material of discs own is inhomogeneous, or laser and/write head temperature influence and make the influence of factor such as Writing power skew,, still needs and carry out aforesaid instant best power and control (ROPC) so implementing best power control (OPC) afterwards.Instant best power control (ROPC) is among CD writer formally writes data the process of discs, according to a target blip level of putting down in writing in the discs Lead-In Area (target reflected pulse level): come the Writing power that aforementioned best power control (OPC) is determined is done the fine setting of (online) immediately.When CD player writes discs with the aforementioned fixation tangential velocity with data, read/write head can be launched an incident pulse (the incident write pulse) sheet of imprinting CDs, this incident pulse meeting forms a reflected impulse (reflected pulse), the steady state level of this reflected impulse (reflected pulse level via the disc reflection; The B-Level that is in the Orange Book to be put down in writing) i.e., the representative depth of sheet of imprinting CDs.When carrying out instant best power control (ROPC), CD player can compare the target blip level that is write down in this reflected impulse level and the original discs, finely tune the Writing power of read/write head according to this, make the reflected impulse level be maintained at suitable size, to guarantee the correctness of discs imprinting.

But lifting along with the CD player access speed, under the control model of conventional fixed linear velocity (CLV), the maximum writing speed of CD writer is difficult for improving, its reason is summarized as follows: under the pattern of static line speed, because its tangential velocity is for fixing, so the rotating speed of Spindle Motor must constantly quicken (by inner ring toward the outer ring time), to keep fixing tangential velocity.That is, to CD carry out imprinting than the outer ring part time, the rotating speed of Spindle Motor is must be enough high could to keep high linear speed.

In view of this, a kind of control mode that is referred to as fixed angles speed (Constant Angular Velocity:CAV) is suggested.Under the pattern of fixed angles speed, the rotating speed of Spindle Motor is for fixing, so in the process that read/write head is being read and write, do not need ceaselessly to change the rotating speed of Spindle Motor as the CD writer of static line speed.

Under the operator scheme of fixed angles speed, the rotating speed of Spindle Motor is fixed, and all there is different tangential velocities each position on the disc thus.If, can obtain better etching/recording quality, make the data read rate of this sheet CD increase so Writing power also can change along with different tangential velocities.Traditional best power control (OPC) is to find out the suitableeest Writing power at a certain fixing tangential velocity earlier, and can't find out suitable Writing power at each tangential velocity on the discs but as previously mentioned.When carrying out instant Writing power control (ROPC), it is to come Writing power is finely tuned with best power control (OPC) value and target blip level again.Right because tangential velocity changes greatly (that is this moment, Spindle Motor was under the high rotating speed), if only write with the OPC value of initial gained, then Writing power is controlled and can't immediately be adjusted Writing power in response to the variation of tangential velocity probably immediately.In addition, because under each tangential velocity, its desirable reflected impulse level may be different, so if all use same target blip level, it writes the result also can be desirable not to the utmost.In view of this, how to design suitable capability correction method, promptly become the problem that each tame manufacturer endeavours to study at fixed angles speed CD player.

Summary of the invention

Therefore fundamental purpose of the present invention provides a kind of Writing power control method that is applied to fixed angles speed operation pattern, this method is before formally data being write discs, set up a control parameter list earlier, thereafter again according to this control parameter list, find out and be applicable to Writing power and the target blip level of desiring the data that writes under each tangential velocity, to use instant best power control (ROPC), data is write discs.

Description of drawings

Fig. 1 is for writing the synoptic diagram of discs.

Fig. 2 is a controlled variable hoist pennants of the present invention.

Fig. 3 is the process flow diagram of Writing power control method of the present invention.

Symbol description

10 discs, 14 capability correction districts

16 Lead-In Areas, 18 record districts

30 control parameter list

Va, Vb, Vc, Vd, Ve, Vf are with reference to tangential velocity

Pa, Pb, Pc, Pd, Pe, Pf are with reference to Writing power

Pa, Pb, Pc, Pd, Pe, Pf are with reference to the reflected impulse level

Embodiment

See also Fig. 1, Fig. 1 is for can write discs (recordable compact disk; CD-R or re-writable CD, CD-RW) 10 synoptic diagram.Discs 10 includes a capability correction district (PowerCalibration Area; PCA) 14 be used for being reference Writing power (write power) and record district (programarea) 18 that Writing capability correction, a Lead-In Area (Lead-in Area) 16 be used for putting down in writing discs 10 and be used for writing data for the user.

See also Fig. 2, Fig. 2 is the synoptic diagram of a control parameter list 30 of the present invention.In simple terms, the present invention is before data is formally write discs 10, finds out a plurality of relevant controlled variable earlier, thereafter again according to these controlled variable, find out the Writing power and the target blip level that are applicable to each tangential velocity, for the usefulness that writes data.These a plurality of controlled variable see control parameter list 30 for details.As shown in Figure 2, control parameter list 30 includes and a plurality ofly with reference to tangential velocity (Linear Velocity) Va, Vb, Vc, Vd, Ve, Vf discs 10 subjunctive moods is divided into five speed sections (Va～Vb, Vb～Vc, Vc～Vd, Vd～Ve, Ve～Vf).Each all has corresponding with reference to th writing power P a, Pb, Pc, Pd, Pe, Pf and with reference to reflected impulse level (reflected pulselevel) Ba, Bb, Bc, Bd, Be, Bf with reference to tangential velocity, these parameters all are stored in the control parameter list 30.With reference to th writing power P a, Pb, Pc, Pd, Pe, Pf is to be used for for determining one to desire the usefulness of the Writing power of the data that writes thereafter, and is to be used for controlling (Running Optimum Power Control for determining this to desire the target blip level of the data that writes (reflected pulse level) thereafter to carry out an instant best power with reference to reflected impulse level Ba, Bb, Bc, Bd, Be, Bf; ROPC), its detailed content will be in follow-up relevant portion explanation.

See also Fig. 3, Fig. 3 is the process flow diagram of Writing power control method of the present invention.It is as follows that now first summary is listed implementation step of the present invention, thereafter again at its detailed description.

Step 100: the rotating shaft rotating speed when writing data according to CD player under the fixed angles velocity mode, calculate the tangential velocity Va and the Vf of discs 10 inner rings and outer ring under this rotating speed;

Step 102: rotary CD sheet 10 is controlled to tangential velocity Va with capability correction district 14, and carries out best power control (OPC) in capability correction district 14, to determine with reference to th writing power P a;

Step 104: rotary CD sheet 10 is controlled to tangential velocity Vf with capability correction district 14, and carries out best power control (optimum power control in capability correction district 14; OPC), to determine with reference to th writing power P f;

Step 106: determine with reference to tangential velocity Vb, Vc, Vd, Ve with reference to tangential velocity Vf with reference to tangential velocity Va and second according to first;

Step 108: determine with reference to th writing power P b, Pc, Pd, Pe with reference to th writing power P f with reference to th writing power P a and second according to first;

Step 110: respectively with each with reference to tangential velocity Va, Vb, Vc, Vd, Ve, Vf and correspondingly in capability correction district 14, write test with reference to th writing power P a, Pb, Pc, Pd, Pe, Pf, and the corresponding reflected impulse that reads back, correspond to each reference reflected impulse level Ba, Bb, Bc, Bd, Be, Bf with decision with reference to tangential velocity;

Step 112: provide and desire one of the data that writes and write tangential velocity; At this, can utilize the position of the present rotating speed of Spindle Motor and read/write head and learn the at present required tangential velocity that writes easily;

Step 114: according to control parameter list 30, determine this to write the affiliated speed section of tangential velocity, and mark off speed section under this two with reference to tangential velocity;

Step 116: two corresponding with reference to Writing power and with reference to the reflected impulse level according to this with reference to tangential velocity institute, determine Writing power and target blip level that this desires the data that writes;

Step 118: implement instant Writing power control (Running Optimum Power Control; ROPC), data is write discs 10.

Above-mentioned step 100 to the purpose of step 110 is determining each controlled variable shown in Fig. 2 control parameter list 30.At first determine maximum and the minimum tangential velocity Va and the Vf (step 100) of discs 10.Generally speaking, in the pattern of fixed angles speed because angular velocity fixes, thus can obtain near discs 10 centers first with reference to tangential velocity Va and near discs 10 outer rims second with reference to tangential velocity Vf.For example under a certain fixed angles velocity mode, the tangential velocity of discs 10 from inner edge to outer grade is that cumulative (2X～5X), then Va is exactly two times of speed, and Vf is exactly five times of speed to five times of speed by two times of speed.

Next, adjust the rotating speed of CD player rotating shaft, make the tangential velocity in capability correction district 14 on the disc 10 equal first, and carry out traditional best power control (OPC), find out the reference th writing power P a (step 102) that corresponds to tangential velocity Va with reference to tangential velocity Va.To the explanation of conventional art, best power control is to write test with different Writing powers, and the result is read back as described above, to find out the Writing power of suitable this tangential velocity.Carry out step 104, adjust the rotating speed of rotating shaft, make the tangential velocity in capability correction district 14 on the disc 10 equal second, and carry out traditional best power control (OPC), to obtain corresponding to the reference th writing power P f of tangential velocity Vf with reference to tangential velocity Vf thereafter.Step 102 and step 104 are earlier to simulate disc 10 in first the rotation situation during with reference to tangential velocity Va with capability correction district 14, to obtain first with reference to th writing power P a, simulate disc 10 in second the rotation situation during with reference to tangential velocity Vf, to obtain second with capability correction district 14 again with reference to th writing power P f.

After determining that first and second is with reference to tangential velocity Va, Vf, can determine other reference tangential velocity Vb, Vc, Vd, Ve (step 106) according to this.In the present embodiment, be to be distributed in equidistant mode that minimum writes tangential velocity Va and maximum writes between the tangential velocity Vf with reference to tangential velocity Vb, Vc, Vd, Ve, and disc 10 is divided into five speed sections.Similarly, also be to be distributed between minimum th writing power P a and the maximum th writing power P f (step 108) with reference to th writing power P b, Pc, Pd, Pe in equidistant mode.

Carry out step 110 thereafter, respectively with reference tangential velocity Va, Vb, Vc, Vd, Ve, Vf and correspondingly in capability correction district 14, write test with reference to th writing power P a, Pb, Pc, Pd, Pe, Pf, and the corresponding reflected impulse that reads back simultaneously, correspond to each reference reflected impulse level Ba, Bb, Bc, Bd, Be, Bf with decision with reference to tangential velocity.So far promptly finish the step of setting up control parameter list 30.

After setting up control parameter list 30, CD writer can begin to carry out normal data write-in program.This moment, the rotating shaft rotating speed of CD player was fixed, that is CD player is that pattern with fixed angles speed writes data.Data is write fashionable, CD player can determine its corresponding tangential velocity (step 112) that writes according to the writing position of desiring the data that writes earlier, this writes speed section under the tangential velocity according to control parameter list 30 decision again, and mark off speed section under this two with reference to tangential velocity (step 114).Then, two corresponding with reference to Writing power and with reference to the reflected impulse level according to this with reference to tangential velocity institute, find out this Writing power of desiring the data that writes and target blip level (step 116) in the mode of interpolation, carry out instant best power control at last, data is write in this discs (step 118).For example, now the hypothesis tangential velocity that writes of desiring the data that writes is Vw, and write tangential velocity Vw is between reference velocity Vc on the control parameter list 30 and reference velocity Vd, can utilize interpolation method (interpolation method) corresponding with reference to th writing power P w and with reference to reflected impulse level Bw this moment to obtain, and is shown below.

$\frac{(\mathrm{Vw}-\mathrm{Vc})}{(\mathrm{Vd}-\mathrm{Vc})}=\frac{(\mathrm{Pw}-\mathrm{Pc})}{(\mathrm{Pd}-\mathrm{Pc})}=\frac{(\mathrm{Bw}-\mathrm{Bc})}{(\mathrm{Bd}-\mathrm{Bc})}$

After trying to achieve the th writing power P w and target blip level Bw that desires the data that writes, can carry out instant best power control (ROPC) data is write discs 10.In writing the process of data, at first, CD player can be launched an incident pulse (the incident write pulse) sheet 10 of imprinting CDs with power P w.Thereafter, CD player can measure the reflected impulse (reflected pulse) that reflects from disc 10 constantly, and the level (Level) of this reflected impulse compared with the target blip level Bw that tries to achieve, further finely tune th writing power P w, data is write discs 10.

By above-mentioned explanation as can be known, this method is to see through the mode of putting control parameter list 30 of building, discs 10 is divided into several speed sections, so can utilize the mode of interpolation to obtain each th writing power P w that desires the data that writes and target blip level Bw rapidly and exactly, to carry out instant best power control.Certainly, the deviser also can control the result to ask for more accurately in response to the regulate the speed number of section of its demand.

Again, though the control parameter list 30 of the foregoing description is to include a plurality of speed sections, yet if only set up two with reference to tangential velocity and corresponding two with reference to Writing power and two with reference to the reflected impulse level, also but purpose of the present invention is reached on certain degree ground, and this two reference velocity is the tangential velocity of discs 10 inner rings and outmost turns not necessarily, any on discs 10 two tangential velocities of inner ring and outermost figure all can be used as two with reference to tangential velocity.Because desire writing for the tangential velocity of the data that writes for each, can utilize known this two with reference to tangential velocity, use interpolation method or process of heterodyning and further obtain correspondingly, and then carry out instant best power control (ROPC) data is write discs 10 with reference to Writing power and with reference to the reflected impulse level.

Compared to conventional art, the present invention sets up a control parameter list, before writing data, obtains earlier compared to each with reference to the reference Writing power of tangential velocity and with reference to the reflected impulse level.According to this control parameter list, obtain a certain Writing power and the target blip level of desiring the data that writes again, carry out instant best power control then data is write discs.Therefore, Writing power control method of the present invention can be easily in response to the different tangential velocity in each position on the discs, and dynamically adjusts Writing power and target blip level, to guarantee to write result's correctness.Its program is simple, enforcement is easy, can significantly promote performance of entire system.

The above only is preferred embodiment of the present invention, and all equalizations of doing according to claims of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.

Claims (4)

1. Writing power control method, the Writing power when being used for controlling a CD player data being write a discs, this method comprises:

With reference to tangential velocity this discs subjunctive mood is divided into a plurality of sections according to a plurality of, and that each has all with reference to tangential velocity is corresponding with reference to Writing power and with reference to the reflected impulse level;

Obtain a tangential velocity that writes of desiring the data that writes;

With reference to tangential velocity, determine present disc section to be written according to those, and with respect to this section to be written two with reference to tangential velocity;

Two corresponding with reference to Writing power and with reference to the reflected impulse level according to this with reference to tangential velocity institute, determine Writing power and target blip level that this desires the data that writes; And

According to this Writing power and target blip level of desiring the data that writes, carry out an instant best power control so that this data is write this discs.

2. Writing power control method as claimed in claim 1, wherein this discs includes a capability correction district and is used for doing Writing capability correction, and this a plurality of with reference to tangential velocity include one first with reference to tangential velocity and one second with reference to tangential velocity, these are a plurality of then to include one first with reference to Writing power and corresponds to this first and second reference line with reference to Writing power and one second respectively with reference to Writing power and cut speed, and this method includes in addition:

Rotate this discs, with the tangential velocity of this capability correction district control establish to this first with reference to tangential velocity, and in this capability correction district, carry out Writing capability correction, to determine this first with reference to Writing power;

Rotate this discs, with the tangential velocity of this capability correction district control establish to this second with reference to tangential velocity, and in this capability correction district, carry out Writing capability correction, to determine this second with reference to Writing power;

According to this first and second with reference to tangential velocity, determine remaining with reference to tangential velocity; And

According to this first and second with reference to Writing power, determine remaining with reference to Writing power.

3. Writing power control method as claimed in claim 2, it includes in addition:

Respectively with each with reference to tangential velocity and correspondingly in this capability correction district, write test with reference to Writing power, and the corresponding reflected impulse that reads back corresponds to each reference reflected impulse level with reference to tangential velocity with decision.

4. Writing power control method as claimed in claim 1 wherein determines the Writing power that this desires the data that writes and the step of target blip level to include:

According to this section to be written write tangential velocity, this two with reference to tangential velocity and this two with reference to tangential velocity corresponding with reference to Writing power, determine this to desire the Writing power of the data that writes; And

According to this desire the data that writes write tangential velocity, this is two corresponding with reference to the reflected impulse level with reference to tangential velocity institute with reference to tangential velocity and this two, determines this to desire the target blip level of the data that writes.

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